CN109194148B - Novel high-precision high-power alternating current constant current source design method - Google Patents
Novel high-precision high-power alternating current constant current source design method Download PDFInfo
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- CN109194148B CN109194148B CN201811184204.XA CN201811184204A CN109194148B CN 109194148 B CN109194148 B CN 109194148B CN 201811184204 A CN201811184204 A CN 201811184204A CN 109194148 B CN109194148 B CN 109194148B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention discloses a novel high-precision high-power alternating current constant current source design method.A two-stage conversion circuit is adopted at an input stage; the input stage adopts a programmable rectifier module which is controlled by an ARM controller to convert input alternating-current voltage into adjustable direct-current voltage, and the programmable adjustable direct-current voltage is 20-500V and is used for driving an SPWM sinusoidal signal generation module; after the programmable rectifying module, adding a second-stage programmable DC-DC programmable Buck module for voltage reduction, wherein the programmable Buck module is controlled by a DSP controller; the current output by the rear-stage load is fed back to the DSP controller, the DSP controller controls the programmable Buck module according to the feedback current, accurate control of the output voltage of the SPWM module is achieved, and when the rear-stage load changes, the voltage of the Buck module is controlled, so that the rear-stage load current can be controlled; a two-stage closed-loop control method is adopted and is based on a DSP + ARM architecture; the output frequency can be adjusted to 50-1500hz, and the current constant current can be adjusted to 100-1000 mA.
Description
Technical Field
The invention relates to an electronic technology, in particular to a novel high-precision high-power alternating current constant current source design method.
Background
The AC constant current source system consists of mainly voltage converting part, frequency synthesizing part and loop control part.
And the voltage conversion part is realized by a buck or boost circuit. The frequency synthesis part adopts the following technologies:
1. the traditional frequency synthesis method is a synthesis method for realizing the required frequency by utilizing a mixer, a frequency divider, a frequency multiplier and a band-pass filter;
2. a method for indirectly generating a desired frequency using a Phase Locked Loop (PLL) technique;
3. according to the direct digital frequency synthesis (DDS), a DDS chip is used to generate the corresponding frequency. And the loop control part adopts open-loop control or simple closed-loop control according to design requirements and is used for detecting and correcting errors existing in the constant-current or constant-voltage output signals.
The existing ac source systems can be generally divided into two types according to their application objects:
1. the alternating current source used for industrial production and life has ultrahigh power (kilowatt level or above), but has low requirement on precision performance indexes; the alternating current source adopts a transformer technology or motor regulation and control to realize the control of the voltage or current range, and the traditional frequency synthesis technology realizes frequency control (if the commercial power frequency is fixed, the frequency is not needed), so the control is difficult in precision;
2. the device is used in the fields of low voltage and weak current, realizes analog signals for controlling micro and small systems, and has the advantages of high precision index performance, very small power (less than a few watts); the system adopts a DDS chip combined with a singlechip controller architecture mode, simply realizes constant current output of high-precision indexes and is limited in power; or a common operational amplifier is combined with a frequency oscillation circuit to build a constant current output system, so that the output power is small anyway.
In fact, due to the diversified development of electronic products, the requirements on the power supply are flexible and various, some unconventional alternating current sources can be used in industrial detection and control, and when the precision, the frequency and the power have specific requirements, the universal power supply cannot meet the requirements.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in the prior art, when the method is used for designing a signal source with larger power (dozens to hundreds of watts), precision indexes and stability indexes are difficult to ensure, and the design is often complex; when the circuit is used for a board level, the precision can reach the standard when weak current control signals are used, the power is usually very low, and the output of wide-range voltage, adjustable frequency and adjustable current is difficult to meet; in specific application, the high-power output, the high-precision output, the stability and other outputs are difficult to be compatible, the invention provides a novel high-precision high-power alternating-current constant-current source design method for solving the problems, a two-stage closed-loop control method is adopted, and the method is based on a DSP + ARM architecture; the output frequency can be adjusted to 50-1500hz, and the current constant current can be adjusted to 100-1000 mA; .
The invention is realized by the following technical scheme:
a novel high-precision high-power alternating current constant current source design method is characterized in that a two-stage conversion circuit is adopted at an input stage; the input stage adopts a programmable rectifier module which is controlled by an ARM controller to convert input alternating-current voltage into adjustable direct-current voltage, and the programmable adjustable direct-current voltage is 20-500V and is used for driving an SPWM sinusoidal signal generation module; after the programmable rectifying module, adding a second-stage programmable DC-DC programmable Buck module for voltage reduction, wherein the programmable Buck module is controlled by a DSP controller; the current output by the rear-stage load is fed back to the DSP controller, the DSP controller controls the programmable Buck module according to the feedback current, accurate control of the output voltage of the SPWM module is achieved, when the rear-stage load changes, the voltage of the Buck module is controlled, and therefore the rear-stage load current can be controlled. If the direct-current voltage of the rectifier module is directly utilized to drive the SPWM module badge full-bridge circuit, the generated sine wave signal contains more stray harmonic waves, and therefore, a stage of independent programmable BUCK circuit is added; according to the current feedback size of the rear-stage output, the accurate control of the output voltage of the module is realized, when the rear-stage load changes, the ARM controls the DC output of the programmable rectifier module and the DSP controls the voltage output of the Buck module, and then the rear-stage load current can be controlled. A two-stage closed-loop control method is adopted and is based on a DSP + ARM architecture; the output frequency can be adjusted to 50-1500hz, and the current constant current can be adjusted to 100-1000 mA.
Further, the SPWM module generates sinusoidal signals, namely a high-frequency SPWM chopped wave generated by the DSP controller is used for controlling the MOS full-bridge inverter module, the sinusoidal signals with required adjustable frequency are generated through the LC filter circuit, and the sinusoidal signals and the filter obtain sinusoidal current signals which are isolated and output through the annular isolation transformer.
Further, the voltage output by the SPWM module is subjected to primary inner loop feedback regulation to control the voltage range output by the DSP, and the secondary feedback regulation is used for regulating the output current and the precision; the primary inner loop feedback comprises a BUCK circuit, an SPWM module and an MOS full bridge circuit, the circuit detects the voltage output by LC filtering, judges the deviation range of the voltage, and feeds back the voltage to the DSP to finely adjust the BUCK circuit output and the SPWM duty ratio; the secondary feedback regulation comprises a programmable rectifier module, a current detection circuit, a DSP controller and an ARM controller, the detection judgment of the output current is fed back to the DSP controller through the current monitoring circuit, and the DSP controller feeds back to the ARM controller and is output by the ARM regulation programmable rectifier module. Keeping the magnitude of the output current value at a set value; PID feedback of the two-stage depth lag lead algorithm achieves the effect of regulating and controlling wide-range voltage and accurate current.
Furthermore, the ARM controller is in control connection with an external controller, the external controller serves as a man-machine interface, and the external controller is powered by an independent linear power supply.
Further, the DSP controller and the current monitor are powered by separate linear power supplies.
The invention has the following advantages and beneficial effects:
1. the invention adopts a two-stage closed-loop control method based on a DSP + ARM architecture; the output frequency can be adjusted to 50-1500hz, and the current constant current can be adjusted to 100-1000 mA; (ii) a
2. The output power of the alternating current constant current source can reach 600W, and the accuracy and stability of the output current and the frequency accuracy and stability can reach high levels; the frequency precision of the current signal can reach 0.5%, and the frequency stability is kept within 2 Hz; the current precision can reach within 0.5 percent, the stability is 1 percent, and the specific requirements can be met;
3. the invention can flexibly adjust the designed maximum power according to the actual load range so as to meet different requirements.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a block diagram of the system design of the present invention.
FIG. 2 is a block diagram of the SPWM module of the present invention.
FIG. 3 is a flow chart of a Buck closed-loop control procedure of the system according to the present invention.
FIG. 4 is a flowchart of the SPWM frequency synthesis control procedure of the present invention.
FIG. 5 is a SPWM sine generation simulation test chart of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1 and 3, a novel high-precision high-power ac constant current source design method adopts a two-stage conversion circuit at an input stage: the input stage is designed by adopting a programmable rectification module which is controlled by an ARM controller, converts input alternating-current voltage into adjustable direct-current voltage, is programmed to be adjustable by 20-500V and is used for driving an SPWM sinusoidal signal generation module; and after the programmable rectifying module, a Buck circuit with two-stage programmable DC-DC is designed and added as a voltage reduction circuit and is controlled by the DSP. If the direct current voltage of the rectifier module is directly utilized to drive the SPWM module badge full-bridge circuit, the generated sine wave signal contains more stray harmonic waves, and therefore, an independent programmable BUCK circuit is added. The method comprises the steps of realizing accurate control of output voltage of a Buck module according to current feedback magnitude of rear-stage output, controlling the voltage of the Buck module when rear-stage load changes, namely controlling rear-stage load current, initializing the EPWM module of a DSP (digital signal processor) when the Buck closed-loop control operates, setting a timer control period to be 20ms, starting timing period operation after receiving a starting command, operating PID (proportion integration differentiation) operation according to a difference value between a set current value and a feedback current value, and realizing the closed-loop control of the current.
As shown in fig. 2, 4 and 5, in the implementation, the SPWM sinusoidal signal generating part generates a high-frequency SPWM chopper wave by using a DSP controller to control the MOS full-bridge inverter module, generates a sinusoidal signal of a required adjustable frequency through the LC filter circuit, and obtains a sinusoidal current signal of an isolated output through the ring isolation transformer and the filter; the main flow for controlling the generation of the SPWM sinusoidal signal comprises the steps of initializing an EPWM module of the DSP and a frequency control word of the DDS, setting the frequency, and finally outputting the SPWM with the corresponding frequency according to the set frequency control word.
A constant current control section: a brand-new design with a secondary regulation function is adopted, the voltage range output by the DSP is controlled by the primary inner loop feedback regulation, and the output current and the accuracy are regulated by the secondary feedback regulation, so that the output current value is kept at a set value. The primary inner loop feedback comprises a BUCK circuit, an SPWM module and an MOS full bridge circuit, the circuit detects the voltage output by LC filtering, judges the deviation range of the voltage, and feeds back the voltage to the DSP to finely adjust the BUCK circuit output and the SPWM duty ratio; the secondary feedback regulation comprises a programmable rectifier module, a current detection circuit, a DSP controller and an ARM controller, the detection judgment of the output current is fed back to the DSP controller through the current monitoring circuit, and the DSP controller feeds back to the ARM controller and is output by the ARM regulation programmable rectifier module. PID feedback of the two-stage depth lag lead algorithm achieves the effect of regulating and controlling wide-range voltage and accurate current.
The ARM controller is in control connection with an external controller, the external controller is used as a human-computer interface, and the external controller is powered by an independent linear power supply; the DSP controller and the current monitor are both powered by separate linear power supplies.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A novel high-precision high-power alternating current constant current source design method is characterized in that a two-stage conversion circuit is adopted in an input stage; the input stage adopts a programmable rectifier module which is controlled by an ARM controller to convert input alternating-current voltage into adjustable direct-current voltage, and the programmable adjustable direct-current voltage is 20-500V and is used for driving an SPWM sinusoidal signal generation module; after the programmable rectifying module, adding a second-stage programmable DC-DC programmable Buck module for voltage reduction, wherein the programmable Buck module is controlled by a DSP controller; the current output by the rear-stage load is fed back to the DSP controller, the DSP controller controls the programmable Buck module according to the fed-back current, accurate control of the output voltage of the SPWM sinusoidal signal generation module is achieved, when the rear-stage load changes, the ARM controller controls the DC output of the programmable rectification module and the DSP controller controls the voltage output of the programmable Buck module, and therefore the rear-stage load current can be controlled;
the voltage output by the SPWM sinusoidal signal generation module is fed back and adjusted by a primary inner ring to control the voltage range output by the DSP controller, and the output current is fed back and adjusted by a secondary inner ring to control the size and the precision of the output current; the primary inner loop feedback comprises a programmable Buck module, an SPWM sinusoidal signal generation module and an MOS full-bridge circuit, the circuit detects the voltage output by the LC filter circuit, judges the deviation range of the voltage, and feeds the voltage back to the DSP controller to finely adjust the BUCK circuit output and the duty ratio of the SPWM sinusoidal signal generation module; the secondary feedback regulation comprises a programmable rectification module, a current detection circuit, a DSP controller and an ARM controller, the detection judgment of the output current by the current detection circuit is fed back to the DSP controller, the DSP controller is fed back to the ARM controller, and the ARM controller adjusts the output of the programmable rectification module;
the SPWM sinusoidal signal generation module generates sinusoidal signals by utilizing a DSP controller to generate high-frequency SPWM chopped waves to control an MOS full-bridge circuit, generates sinusoidal signals with required adjustable frequency through an LC filter circuit, and obtains sinusoidal current signals of isolated output through an annular isolation transformer and a filter.
2. The design method of the novel high-precision high-power alternating current constant current source as claimed in claim 1, wherein the ARM controller is in control connection with an external control machine, the external control machine is used as a man-machine interface, and the external control machine is powered by a single linear power supply.
3. The design method of the novel high-precision high-power alternating current constant current source according to claim 1, wherein the DSP controller and the current detection circuit are powered by separate linear power supplies.
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Effective date of registration: 20210415 Address after: 621000 building 31, No.7, Section 2, Xianren Road, Youxian District, Mianyang City, Sichuan Province Patentee after: China Ordnance Equipment Group Automation Research Institute Co.,Ltd. Address before: 621000 Mianyang province Sichuan City Youxian District Road No. 7 two immortals Patentee before: China Ordnance Equipment Group Automation Research Institute |
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